# Linking Fluid and Kinetic Scales in Solar Wind Turbulence

## TL;DR

This paper explores the connection between large-scale and small-scale features of solar wind turbulence, revealing correlations between polarization states and plasma parameters, and linking wave types to plasma instabilities.

## Contribution

It demonstrates, for the first time, the correlation between polarization at kinetic scales and inertial range turbulence, and associates polarization types with specific plasma instabilities.

## Key findings

- Clear correlations between polarization and plasma parameters.
- Different polarization types occupy distinct instability regions.
- First demonstration of polarization-instability link in solar wind.

## Abstract

We investigate possible links between the large-scale and small-scale features of solar wind fluctuations across the frequency break separating fluid and kinetic regimes. The aim is to correlate the magnetic field fluctuations polarization at dissipative scales with the particular state of turbulence within the inertial range of fluctuations. We found clear correlations between each type of polarization within the kinetic regime and fluid parameters within the inertial range. Moreover, for the first time in literature, we showed that left-handed and right-handed polarized fluctuations occupy different areas of the plasma instabilities-temperature anisotropy plot, as expected for Alfv$\acute{\textrm{e}}$n Ion Cyclotron and Kinetic Alfv$\acute{\textrm{e}}$n waves, respectively.